Color signal interpolation system and method
a color signal and interpolation technology, applied in the field of color signal interpolation, can solve the problems of resolution reduction, difficult to improve the crosstalk effect, and the error component of the green photosite pixel value, so as to avoid resolution reduction and reduce the crosstalk effect
Active Publication Date: 2011-07-12
ICATCH TECH INC
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Benefits of technology
"The invention provides a color signal interpolation system and method that can avoid resolution reduction and crosstalk effect caused by the green error. The method involves performing a first color sample interpolation on a signal with a cross-color sample. The system includes a sensor, line buffer, luminance compute device, edge determinator, reconstruction filter, average device, and selector. The method includes computing a luminance of an interpolation sample and neighboring color samples, determining if the edge value is smaller than a predetermined threshold, computing an average of neighboring color samples that have the same color with the interpolation sample when the edge value is smaller than the predetermined threshold, and selecting one of the interpolation sample, the first color interpolation value, and the average as the first color output. The technical effect of the invention is to improve the quality and accuracy of color signal interpolation."
Problems solved by technology
In this case, the pixel value of a green photosite presents an error component.
However, the threshold is computed with pixels (on the RGB domain) captured by the image sensor, which encounters the problems of lower representative, easy to cause a resolution reduction, and hard to improve the crosstalk effect caused by a green error.
Method used
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[0019]FIG. 2 is a block diagram of a color signal interpolation system in accordance with the invention, which performs a first color (green) sample interpolation on a signal with a cross-color sample. The system first converts pixels from the Bayer pattern domain, a subset of the RGB domain, to a luminance domain, and then computes the edges of the pixels. Because the edges are estimated on the luminance domain, it is determined accurately that a pixel to be interpolated locates in a flat area or edge area. In FIG. 2, the system includes a sensor 210, a line buffer 220, a luminance compute device 230, an edge determinator 240, a reconstruction filter 250, an average device 260 and a selector 270.
[0020]The sensor 210 has the Bayer color filter array to provide the signal with the cross-color sample. In the FIG. 1, the photosites of the sensor 210 are arranged in a Bayer pattern. FIG. 3A is a schematic diagram of a green photosite and its neighboring green pixels in accordance with t...
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A color signal interpolation system and method, which performs a green sample interpolation on a signal with a cross color sample. The method includes: (A) providing neighboring color samples on an interpolation sample; (B) computing a luminance respectively of the interpolation sample and the neighboring color samples; (C) computing an edge value of the interpolation sample based on the luminance computed; (D) determining if the edge value is smaller than a predetermined threshold; (E) computing an average of the neighboring color samples that have the same color with the interpolation sample when the edge value is smaller than the predetermined threshold, and using the average as a first color output of the interpolation sample.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to the technical field of color signal interpolation and, more particularly, to a color signal interpolation system and method for reconstructing green color.[0003]2. Description of Related Art[0004]A color image processing system essentially includes an image capture unit, an image reconstruction and processing unit, an image display and an image compression unit. The image capture unit includes an image sensor and a color filter array (CFA). FIG. 1 is a schematic diagram of a Bayer CFA and associated interpolation operations. As shown in FIG. 1, the frame is arranged in a form of interlaced GR-contained row and BG-contained row, where R, G and B are the three primary colors: green, red and blue (RGB). Each photosite in the CFA can have only one of RGB. The image reconstruction and processing unit thus uses an interpolation to reconstruct missing colors for each photosite, which fills up the respe...
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IPC IPC(8): G06K9/00G06T5/00
CPCH04N9/045H04N2209/046H04N23/843H04N25/134
Inventor WU, CHENG-YU
Owner ICATCH TECH INC